I've thought about it, but not sure yet. I want to figure out a way that I don't have to take off the alternator to disconnect the heater. That line has water flowing all the time, so it has to remain open. I was thinking of an in line ball valve H to close off and redirect flow to heater, then I can disconnect the heater, open the H valve, close off other valves, and use it without the cab. But adding valves like that feels like adding a point of failure.
I think I'm going to get 20' of hose and put the heater in the top rear of the cab blowing forward. It'd be a bit of a pain to wire and pipe but would be the most unobstructed place I can think of. I can't put the back up against anything because the blower motor protrudes, and I need airflow for it to blow properly.